Z.ai: GLM Flash Latest vs OpenAI: GPT-5.6 Terra Pro
Side-by-side comparison of specs, pricing, benchmark scores, and task rankings. Updated 2026-10-19.
| Z.ai: GLM Flash Latest | OpenAI: GPT-5.6 Terra Pro | |
|---|---|---|
| Vendor | ~z-ai | openai |
| Quality Score | 100 | 100 |
| Input Price | $0.05/M | $2.00/M |
| Output Price | $0.20/M | $12.00/M |
| Context Window | 1,048,576 | 1,050,000 |
| Max Output | 943,718 | 128,000 |
| Tool Calling | ✓ | ✓ |
| Structured Output | ✓ | ✓ |
| Reasoning Mode | ✓ | ✓ |
| Vision | ✓ | ✓ |
| Audio | - | - |
The verdict
For a sample job of 1 million input tokens and 250,000 output tokens, GLM Flash Latest costs $0.098 and GPT-5.6 Terra Pro costs $5.00, so GLM Flash Latest is about 51.0 times cheaper for the same work.
Both take in a similar amount of text: 1,048,576 and 1,050,000 tokens, about 1,573 and 1,575 pages.
Only GLM Flash Latest offers video input.
Across the 10 tasks where they differ, GLM Flash Latest scores higher on 10 (SQL Generation, Code Completion, Code Documentation and others).
GLM Flash Latest was released in August 2026 and GPT-5.6 Terra Pro in July 2026.
Pick GLM Flash Latest if you need lower cost, video input or the stronger all-round task scores.
Costs use current list prices per million tokens; page counts assume about 0.75 words per token and 500 words per page.
Who wins by task?
| Task | Z.ai: GLM Flash Latest | OpenAI: GPT-5.6 Terra Pro |
|---|---|---|
| SQL Generation | 134 | 132 |
| Code Completion | 132 | 117 |
| Code Documentation | 132 | 129 |
| Regex Writing | 120 | 117 |
| CSV / Spreadsheet Cleanup | 134 | 132 |
| JSON Extraction | 132 | 121 |
| Bulk Data Labeling | 129 | 117 |
| Long-Document Summarization | 138 | 136 |
| Short-Form Summarization | 124 | 113 |
| Blog Post Writing | 122 | 120 |
Scores reflect capability match + benchmark data + pricing for each task. Methodology →